Sitting in the living room reading. I hear what could be a dripping faucet so I go to the kitchen and check. Not that. I go all around the room listening, and finally home in on my color display (1512-RX). I can hear a faint "whirring" sound, like an old timey electric clock. Every few seconds I can hear a tick sound. It's not regular but it makes this tick sound every 3-5 seconds or so. I've noticed this for several weeks now. Tell me, why would this electronic device with apparently no moving parts, be making any sound at all?